	var show_num = [];
	// 获取验证码60秒倒计时
    var countdown=60;
	function settime(obj) { 
	    if (countdown == 0) { 
	        obj.removeAttribute("disabled");    
	        obj.value="免费获取验证码"; 
	        countdown = 60; 
	        return;
	    } else { 
	        obj.setAttribute("disabled", true); 
	        obj.value="重新发送(" + countdown + ")"; 
	        countdown--; 
	    } 
	    setTimeout(function() {
	    		settime(obj) 
	    	},1000) 
		}

	/*var nowurl=window.location.pathname,nowcs=window.location.search;
	var turl=nowurl+nowcs;
	 当前页面导航高亮 
	$(function() {
	$("#nav_main li").each(function() {
		var that = this;
		var nurl=$(that).find("a").attr("href");
			if (nurl==turl){
				$(that).addClass("selected-color").siblings().removeClass("selected-color");
			}
		});
	})*/
	function draw(show_num) {
		var canvas_width = $('#canvas').width();
		var canvas_height = $('#canvas').height();
		var canvas = document.getElementById("canvas"); // 获取到canvas的对象，演员
		var context = canvas.getContext("2d"); // 获取到canvas画图的环境，演员表演的舞台
		canvas.width = canvas_width;
		canvas.height = canvas_height;
		var sCode = "A,B,C,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,W,X,Y,Z,1,2,3,4,5,6,7,8,9,0";
		var aCode = sCode.split(",");
		var aLength = aCode.length; // 获取到数组的长度
	
		for(var i = 0; i <= 3; i++) {
			var j = Math.floor(Math.random() * aLength); // 获取到随机的索引值
			var deg = Math.random() * 30 * Math.PI / 180; // 产生0~30之间的随机弧度
			var txt = aCode[j]; // 得到随机的一个内容
			show_num[i] = txt.toLowerCase();
			var x = 10 + i * 20; // 文字在canvas上的x坐标
			var y = 20 + Math.random() * 8; // 文字在canvas上的y坐标
			context.font = "bold 23px 微软雅黑";
	
			context.translate(x, y);
			context.rotate(deg);
	
			context.fillStyle = randomColor();
			context.fillText(txt, 0, 0);
	
			context.rotate(-deg);
			context.translate(-x, -y);
		}
		for(var i = 0; i <= 5; i++) { // 验证码上显示线条
			context.strokeStyle = randomColor();
			context.beginPath();
			context.moveTo(Math.random() * canvas_width, Math.random() * canvas_height);
			context.lineTo(Math.random() * canvas_width, Math.random() * canvas_height);
			context.stroke();
		}
		for(var i = 0; i <= 30; i++) { // 验证码上显示小点
			context.strokeStyle = randomColor();
			context.beginPath();
			var x = Math.random() * canvas_width;
			var y = Math.random() * canvas_height;
			context.moveTo(x, y);
			context.lineTo(x + 1, y + 1);
			context.stroke();
		}
}

function randomColor() { // 得到随机的颜色值
	var r = Math.floor(Math.random() * 256);
	var g = Math.floor(Math.random() * 256);
	var b = Math.floor(Math.random() * 256);
	return "rgb(" + r + "," + g + "," + b + ")";
}
